Quectel EC25-E-LTE kit

1x Quectel EC25-E modem
1x LTE antenna
1x LTE pigtail

EC25-E chip is locked to Europe, the Middle East, South Korea, Thailand, and India. It won't work in other regions.

Datasheet.

This modem works well with OpenWRT in QMI mode. It achieves about 100Mbit/s in practice.

Consider buying an additional antenna to increase bandwidth. 

Note about installing this modem in TLsense devices.

Note, this modem has chips on top and bottom. In TLsense, the modem doesn't have enough space because of the extra motherboard standoff. See the last photo. If you want to use this modem in TLsense we suggest removing the standoff with pliers as shown in the video: https://www.youtube.com/watch?v=5ahAHPmmCVY 

The standoff can be safely removed, but please be careful not to damage chips around it. Use pliers and turn the standoff around and side-to-side. It will come off. Another option is to dremel or drill the aluminum stub circled on the photo, but that's not recommended because it's easy to damage the motherboard. 

Alternatively, you can consider buying an external TRB140 modem

This is not a problem in APU, as it doesn't have this extra standoff.